The Better Business Bureau advises caution when purchasing 9/11 memorabilia this coming weekend which sees the country observing the 10th anniversary of that fateful day.

VICTORIA, Texas – With the 10-year anniversary of the Sept. 11 terrorist attacks approaching, Better Business Bureau is advising consumers that the value of most memorabilia and commemorative items is sentimental; Prices for many items will likely drop over time.

Patriotic websites are promoting magnets, pins, flags, clothing, license tags, license frames and jewelry, among other items as a way to remember the anniversary. Sellers are also marketing commemorative items on auction sites like eBay, where the seller must rely on emailed questions and online photos to determine an item’s value.